Nature's Way Fiber Fusion Daily

Our assessment

The evidence shows that the active ingredient in Nature's Way Fiber Fusion Daily, Calcium, is a well-established mineral for bone health. Our assessment is that this supplement can be a convenient way to support your calcium intake, but you need to be mindful of the total calcium you consume from all sources, including food and other supplements [NIH ODS]. The data does not provide specific dosage information for this product, so you should follow the label directions carefully.

How it works

Think of calcium as a building block for your skeleton. It works through bone mineralization to support bone density and mineral deposition, which helps keep your bones strong. Additionally, it plays a role in neuromuscular relaxation, supporting proper muscle relaxation and nerve signaling [NIH ODS].

Safety profile

Data not available for side effects specific to this product. However, for calcium supplements in general, some research suggests that high intakes might increase the risk of heart disease and prostate cancer. High levels of calcium in the blood and urine can cause poor muscle tone, poor kidney function, low phosphate levels, constipation, nausea, weight loss, extreme tiredness, frequent need to urinate, abnormal heart rhythms, and a high risk of death from heart disease [NIH ODS]. The FDA has received a total of 592,059 adverse event reports across all supplements, but a specific count for this product is not available [FDA data].

Our recommendation

Start by checking the label for the exact serving size and calcium amount per serving. Be aware that calcium can reduce the absorption of several medications, including bisphosphonates, tetracycline antibiotics, fluoroquinolone antibiotics, levothyroxine, and phenytoin [NIH ODS]. If you take any of these, separate your supplement intake by at least two hours. We recommend you speak with your doctor or a registered dietitian to determine the right total daily calcium intake for your individual needs, especially if you have a history of kidney stones or heart conditions [NIH ODS].

Supplement labels contain several key sections regulated by the FDA:

• Serving Size — The recommended amount per dose. Always check this — some products require multiple capsules per serving.
• Amount Per Serving — Shows the quantity of each nutrient in the product, typically in IU (International Units), mg (milligrams), or mcg (micrograms).
• % Daily Value (%DV) — Indicates how much a nutrient in a serving contributes to a daily diet. 5% DV or less is low; 20% DV or more is high.
• Other Ingredients — Lists inactive ingredients like fillers, binders, and capsule materials (e.g., gelatin, cellulose, magnesium stearate).
• Suggested Use — The manufacturer's recommended directions for taking the supplement, including timing and dosage.

Source: FDA Dietary Supplement Labeling Guide